{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{6}{c}}
\toprule
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}&\multicolumn{1}{c}{(5)}&\multicolumn{1}{c}{(6)}\\
                    &\multicolumn{1}{c}{OLS\_ALL}&\multicolumn{1}{c}{OLS\_BIG}&\multicolumn{1}{c}{BTW\_ALL}&\multicolumn{1}{c}{BTW\_BIG}&\multicolumn{1}{c}{POLS\_ALL}&\multicolumn{1}{c}{POLS\_BIG}\\
\midrule
Income              &       0.363         &      0.0651         &       0.221         &      0.0655         &       0.237         &      0.0725         \\
                    &     (0.286)         &    (0.0517)         &     (0.136)         &    (0.0481)         &     (0.145)         &    (0.0419)         \\
\addlinespace
Constant            &      -19.15         &      -2.826         &      -8.653         &      -1.192         &      -15.06         &      -3.048         \\
                    &     (14.12)         &     (1.810)         &     (6.127)         &     (1.648)         &     (9.534)         &     (1.495)         \\
\addlinespace
Time effects        &          No         &          No         &          No         &          No         &         Yes         &         Yes         \\
\midrule
N                   &          43         &          26         &         645         &         390         &         645         &         390         \\
R2                  &       0.026         &       0.035         &       0.028         &       0.029         &       0.039         &       0.055         \\
\bottomrule
\end{tabular}
}
